Fabricated pump casing

Abstract

A fabricated split pump casing is disclosed in which the suction chamber and discharge chamber are both on the same side of the casing section. The volute is fabricated from a plurality of sections with the minor section of the volute being located within the suction chamber thereby providing maximum suction chamber area.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 
     
       1. A fabricated split casing for a pump; a first casing section fabricated from sheet steel and defining a suction chamber having an entrance opening for fluid and a discharge chamber having a discharge opening for fluid;   a first casing section flange means fabricated from sheet steel to which said suction chamber and said discharge chamber are welded;   a pair of spaced apart semi-circular volute rings each welded to said first casing section flange means;   a first one-half section of a volute fabricated from sheet steel welded within the first casing section to said flange means, and within said suction chamber;   a first semi-cylindrical bearing support welded to said suction chamber and to said first casing flange means, and extending outwardly from said suction chamber;   a second casing section fabricated from sheet steel;   a second casing section flange means fabricated from sheet steel complementary to said flange means associated with said first casing section for mating engagement to provide a casing parting line;   a second semi-cylindrical bearing support welded to said suction chamber and to said second casing flange means, and extending outwardly from said suction chamber;   a pair of spaced apart semi-circular volute rings each welded to said second casing section flange means, said pairs of volute rings associated with said first and second casing section defining volute fluid entry passages when said casing sections are mated;   a second one-half section of a volute fabricated from sheet steel welded to the second casing section flange means and adapted to be in communication with said one-half volute associated with said first casing section and said discharge chamber when said first and second casing sections are mated.   
     
     
       2. A fabricated pump casing according to claim 1 wherein the suction chamber and the discharge chamber are fabricated as separate members welded to the flange means of said first casing section. 
     
     
       3. A fabricated pump casing according to claim 2 wherein the suction chamber is formed as a rectangular box structure in which the small portion of the volute passes. 
     
     
       4. A fabricated pump casing according to claim 3 wherein said volute is fabricated from eighteen separate sections welded together, said volute sections being divided equally between the two split sections of the casing. 
     
     
       5. A fabricated pump casing according to claim 4 wherein the angle between each volute section is between 15°-20° with the center being located at the center of the impeller chamber.